Paper tube



(No Model.)

P. CAREY. PAPER TUBE.

No. 489,927. Patented Jan. 1?,.18931 IlirEn STATES PATENT OFFICE.

PHILIP CAREY, OF CINCINNATI, OHIO.l

PAPER TUBE.

SPECIFICATION forming part of Letters Patent No. 489,927, dated January17, 1893.

Application tiled January 30, 1891. Serial No. 379.664. (No model.)

To all whom it may concern,.-

Be it known that I, PHILIP CAREY, a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Paper Tubes forElectrical Purposes and the Like, of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawings, forming part of this specification.

My improvement relates to paper tubes intended to serve as conduitsgenerally but more especially for speaking tubes, electric light wiresand the like, and it consists of such ilnprovements in construction andtreatment as to render said tubes practically re and water proof.

In the drawings, Figure l represents, partly in, elevation and partly insection, a short piece of the tube; and Fig. 2 a lateral section of thesame.

In myimprovements the manner of making and the methods of treating thetube varies somewhat in accordance with the character with soluble glassin the well known way to render it lire proof and it is then ready toruse. This treatment of soluble glass is an essential element of themanufacture, as withoutit, the asbestus will absorb water in its naturalstate.

In constructing the tube the layer A is first treated with wax or anykind of oil produced from crude petroleum (except kerosene or naphtha)mixed with coal tar pitch or asphalt. This method of treatment givesgood water proof results. The layerA is then coated on both sides withasbestus B B and the whole tube treated with soluble glass to rendersame re proof. In this way a tube is produced that is practically bothwater and tire proof. The soluble glass alone may not perhaps render thetube permanently water proof but the water proof paper in connectionwith the soluble glass and asbestus renders the tube both lire and waterproof.

Having thus described my invention, what I claim and desire to secure byLetters Patent, iszl. A tube composed of a layer of waterprooi:` papercovered with a layer of asbestus treated with soluble glass,substantially as described.

2. A tube composed of a layerot Waterproof paper and interior andexterior layers of asbestus treated with soluble glass, substantially asdescribed.

PHILIP CAREY.

IVitnesscs:

NATHANIEL WRIGHT, J r., GEORGE HEIDMAN.

